Electronically phased detector arrays for optical imaging

Details Electronically phased detector arrays for optical imaging Electronically phased detector arrays for optical imaging

1989-03-03

1992-03-03

Wallace, Linda J.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250332, 250334, 250349, 250353, 358212, 356345, 356349, 89 4106, G01J 120, G02B 2610

Patent

active

050935631

ABSTRACT:
An optical imaging system includes an array of small aperture subtelescopes each with heterodyne detectors. The array detects the amplitude and phase of light waves emanating from a scene under observation before they are combined into an image. The beam combining and interfering functions are performed after detection by the use of novel electronic signal processsing. Large-aperture resolution is synthesized by electronically detecting and correcting phase errors without optical phase compensating components. Parallel processing and atmospheric turbulence compensation are achieved. The system images laser illuminated or naturally illuminated targets as well as stationary or moving targets. The heterodyne detectors can also achieve similar results when arranged in a pupil plane array located behind a single large aperture telescope.

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